50 self-test cards built from the two final-revision maps — every card is a question that already appeared in the 2023, 2024 and 2025 PSLE Science papers. Tap a card to flip it. In print, cover the answer to test yourself.
All 50 Life Science 26 Physical Science 24 Show all answers Shuffle
Plants · Reproduction 1 What happens during pollination? tap to flip Plants · Reproduction 1 Pollen joins the ovule on the stigma, forming a seed. The ovary becomes the fruit. answer — tap to flip back Plants · Reproduction 2 Name the four ways seeds are dispersed. tap to flip Plants · Reproduction 2 Wind, water, animals or explosive — the seed's own feature does the job: wing-like, floats, hooks, or splits. answer — tap to flip back Plants · Reproduction 3 What three things does a seed need to germinate? tap to flip Plants · Reproduction 3 Water, air and warmth — not soil, and not light. answer — tap to flip back Plants · Reproduction 4 What feeds the seedling before it has leaves? tap to flip Plants · Reproduction 4 The stored food inside the seed. answer — tap to flip back Plants · Water & Food 5 What do roots take in, and what carries it up? tap to flip Plants · Water & Food 5 Roots take in water and minerals; the water-carrying tubes carry them up to the leaves. answer — tap to flip back Plants · Water & Food 6 Write the word equation for photosynthesis. tap to flip Plants · Water & Food 6 Water + carbon dioxide, with light and chlorophyll, make glucose (stored as starch) + oxygen. answer — tap to flip back Plants · Water & Food 7 What do food-carrying tubes do? tap to flip Plants · Water & Food 7 They carry food to the growing parts of the plant. answer — tap to flip back Plants · Water & Food 8 How is water lost from a leaf? tap to flip Plants · Water & Food 8 As water vapour, through the stomata. answer — tap to flip back Life Cycles 9 Which animals have four stages? tap to flip Life Cycles 9 Mosquito and butterfly: egg, larva, pupa, adult. answer — tap to flip back Life Cycles 10 Which animals have three stages? tap to flip Life Cycles 10 Cockroach, grasshopper and frog. answer — tap to flip back Life Cycles 11 How do you spot an insect? tap to flip Life Cycles 11 Six legs and three body parts. answer — tap to flip back Life Cycles 12 What do all living things do? tap to flip Life Cycles 12 Grow, reproduce, respond to changes, and need food, water and air. answer — tap to flip back Cells 13 Why does a root cell have no chloroplasts? tap to flip Cells 13 There is no light underground, so the cell cannot photosynthesise. answer — tap to flip back Cells 14 Name three useful microorganisms. tap to flip Cells 14 Bacteria, fungi and yeast — they make bread and yoghurt, and break things down. answer — tap to flip back Cells 15 How can microorganisms be harmful? tap to flip Cells 15 They spoil food and cause disease. answer — tap to flip back Breathing & Blood 16 Where does gas exchange happen? tap to flip Breathing & Blood 16 In the lungs, where the air comes into contact with the blood. answer — tap to flip back Breathing & Blood 17 What happens to the heart rate during exercise? tap to flip Breathing & Blood 17 It rises, to deliver more oxygen to the working parts of the body. answer — tap to flip back Digestion 18 Name the parts of the digestive system in order. tap to flip Digestion 18 Mouth, gullet, stomach, small intestine, large intestine. answer — tap to flip back Digestion 19 Where is digested food absorbed? tap to flip Digestion 19 In the small intestine. answer — tap to flip back Food Chains 20 What is a producer? tap to flip Food Chains 20 A green plant — the direct energy source for the animals in the chain. answer — tap to flip back Food Chains 21 What do the arrows in a food chain show? tap to flip Food Chains 21 The flow of energy from one living thing to the next. answer — tap to flip back Food Chains 22 Population or community? tap to flip Food Chains 22 One kind of living thing is a population; different populations together are a community. answer — tap to flip back Food Chains 23 What does extra fertiliser do to a pond? tap to flip Food Chains 23 It shifts the numbers of the living things in it. answer — tap to flip back Adaptations 24 Structural or behavioural adaptation? tap to flip Adaptations 24 Structural: fur, blubber, camouflage. Behavioural: migration, hibernation. answer — tap to flip back Adaptations 25 What does deforestation do to the air? tap to flip Adaptations 25 It raises the amount of carbon dioxide. answer — tap to flip back Adaptations 26 Why do animals become endangered or extinct? tap to flip Adaptations 26 Pollution and habitat loss. answer — tap to flip back States of Matter 27 Which changes of state gain heat? tap to flip States of Matter 27 Melting, boiling and evaporation. answer — tap to flip back States of Matter 28 Which changes of state lose heat? tap to flip States of Matter 28 Condensation and freezing. answer — tap to flip back States of Matter 29 What happens to temperature during a change of state? tap to flip States of Matter 29 It stays the same until the change is complete. answer — tap to flip back States of Matter 30 Boiling or evaporation? tap to flip States of Matter 30 Boiling: bubbles form throughout the liquid, at a fixed temperature. Evaporation: from the surface only, at any temperature. answer — tap to flip back States of Matter 31 What is dew? tap to flip States of Matter 31 Water vapour condensing on a cold surface. answer — tap to flip back Electricity 32 What does an open switch do? tap to flip Electricity 32 It breaks the circuit, so no current flows and the bulb goes out. answer — tap to flip back Electricity 33 How do you make a bulb brighter? tap to flip Electricity 33 Use more batteries, or fewer bulbs, in the same circuit. answer — tap to flip back Electricity 34 Why does a bulb blow? tap to flip Electricity 34 Too much current — too many batteries, or too few bulbs, in the circuit. answer — tap to flip back Heat 35 How does heat travel through a solid? tap to flip Heat 35 Particle to particle — best in metals. This is conduction. answer — tap to flip back Heat 36 Why does a double wall with air between slow heat loss? tap to flip Heat 36 Air is a poor conductor of heat, so heat passes through it slowly. answer — tap to flip back Heat 37 What does heating do to a metal? tap to flip Heat 37 Heating expands it; cooling contracts it. answer — tap to flip back Heat 38 How does a hot metal rim fit onto a wheel? tap to flip Heat 38 Heating expands the rim, so it slips on; as it cools it contracts and grips. answer — tap to flip back Magnets 39 Like poles? Unlike poles? tap to flip Magnets 39 Like poles repel, unlike poles attract. The force acts at a distance, strongest at the poles. answer — tap to flip back Magnets 40 What do magnets attract? tap to flip Magnets 40 Iron and steel only. answer — tap to flip back Magnets 41 What is an electromagnet? tap to flip Magnets 41 A current in a coil around an iron bar — a magnet that switches off when the current stops. answer — tap to flip back Light 42 How do you make a shadow bigger? tap to flip Light 42 Move the object or the light closer to the screen. answer — tap to flip back Light 43 Transparent, translucent or opaque? tap to flip Light 43 Transparent lets almost all light through, translucent some, opaque none. answer — tap to flip back Springs 44 What does a spring do when it is pulled or squeezed? tap to flip Springs 44 It stretches when pulled and pushes back when squeezed, storing elastic potential energy. answer — tap to flip back Springs 45 How is the stretch related to the force? tap to flip Springs 45 The greater the stretch or squeeze, the greater the force. answer — tap to flip back Materials 46 How do you choose the right material? tap to flip Materials 46 By its properties — strength, flexibility, waterproofing and transparency. answer — tap to flip back Materials 47 How do you find the volume of a floating object? tap to flip Materials 47 By displacement. answer — tap to flip back Forces & Energy 48 What do gravity and friction do? tap to flip Forces & Energy 48 Gravity pulls things down; friction opposes movement. Friction is helpful for grip and braking, harmful as wear. answer — tap to flip back Forces & Energy 49 Energy change in a lamp? tap to flip Forces & Energy 49 Electrical to light + heat. answer — tap to flip back Forces & Energy 50 Energy change in a spring, and where does energy go? tap to flip Forces & Energy 50 Elastic to kinetic — and some energy always escapes as heat. answer — tap to flip back
